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GB/T 26548.6-2018: Hand-held portable power tools -- Test methods for evaluation of vibration emission -- Part 6: Rammers
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Hand-held portable power tools -- Test methods for evaluation of vibration emission -- Part 6: Rammers
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Basic data | Standard ID | GB/T 26548.6-2018 (GB/T26548.6-2018) | | Description (Translated English) | Hand-held portable power tools -- Test methods for evaluation of vibration emission -- Part 6: Rammers | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J48 | | Classification of International Standard | 13.160; 25.140.10 | | Word Count Estimation | 18,162 | | Date of Issue | 2018-02-06 | | Date of Implementation | 2018-09-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 26548.6-2018: Hand-held portable power tools -- Test methods for evaluation of vibration emission -- Part 6: Rammers
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Hand-held portable power tools--Test methods for evaluation of vibration emission--Part 6. Rammers
ICS 13.160; 25.140.10
J48
National Standards of People's Republic of China
Handheld portable power tool vibration test method
Part 6. Tamping machine
emission-Part 6. Rammers
(ISO 28927-6.2009, IDT)
Published on.2018-02-06
2018-09-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Content
Foreword I
Introduction II
1 Scope 1
2 Normative references 1
3 Terms, definitions and symbols 1
4 Basic criteria and vibration test methods 2
5 description of machine type 2
6 Vibration characteristics description 3
7 Instrument Requirements 4
8 Machine test and operating conditions 5
9 Measurement procedures and effectiveness of measurements 7
10 Test Report 8
Appendix A (informative appendix) Compaction machine vibration test report format 9
Appendix B (normative appendix) Determination of uncertainty 11
Appendix C (Normative Appendix) Design of tamping machine energy absorbers 13
Reference 14
Foreword
GB/T 26548 "Handheld Portable Power Tools Vibration Test Method" is divided into the following parts.
--- Part 1. Angle and end face grinders;
--- Part 2. air trigger, nut wrench and screwdriver;
--- Part 3. Polishing machines, rotary, slide and duplex sanders;
--- Part 4. Straight shank grinders;
--- Part 5. Drills and impact drills;
--- Part 6. Compaction machine;
--- Part 7. Punching machine and scissors;
--- Part 8. Reciprocating saws, polishers and borings and pendulum or rotary saws;
---Part 9. Descaling hammer and needle beam rust remover;
---Part 10. Impact rock drills, hammers and crushers;
--- Part 11. Stone hammer;
--- Part 12. Mold grinder.
This part is the sixth part of GB/T 26548.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part uses the translation method equivalent to ISO 28927-6.2009 "Handheld portable power tools vibration test method Part 6.
The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows.
---GB/T 5621-2008 Rock drill machinery and pneumatic tools performance test method (ISO 2787. 1984, MOD)
--- GB/T 6247.1-2013 Rock drilling machines and portable power tools - Terms - Part 1. Rock drilling machines, pneumatic tools and
Pneumatic machinery (ISO 5391.2003, MOD)
This section has made the following editorial changes.
--- Convert the "bar" in the international standard to "MPa" (1bar = 0.1MPa);
--- Corrected the error content of the experimental conditions in Table A.1 of the international standard.
This part was proposed by the China Machinery Industry Federation.
This part is under the jurisdiction of the National Standardization Technical Committee for Rock Drilling Machinery and Pneumatic Tools (SAC/TC173).
This section drafted by. Changsha Research Institute of Mining and Metallurgy Co., Ltd., Tianshui Rock Drilling Machine Pneumatic Tools Research Institute, Hunan Hengzhi Drilling Division
Technology Co., Ltd., Dongguan Institute of Technology.
The main drafters of this section. Gao Bo, Wang Jianzu, Luo Youxin, Zhou Yirong, Wu Duxi, Shuangzhi, Wang Jianhua, Li Guijie, Zhou Bin.
Introduction
This document is a Class C standard as defined in ISO 12100.
For machines designed and manufactured in accordance with the requirements of Class C standards, the requirements for Class C standards are different from those for Class A or Class B standards.
When the requirements in the C standard are better than other standards.
General technical conditions for hand-held and hand-guided mechanical vibration measurement are given in GB/T 25631. GB/T 26548 is based on this standard.
Based on the vibration test method of the hand-held portable machine, as well as the operation of the machine under the type test conditions and the performance of the type test
He asked. The standard structure and chapter number are consistent with GB/T 25631.
This part adopts the sensor reference positioning method adopted for the first time in the European series standard EN60745, due to continuity reasons.
The description is inconsistent with GB/T 25631. The sensor is preferably placed close to the area between the thumb and forefinger of the hand because this position is
The operator has minimal interference with the machine.
It has been found that the vibrations typically produced by compactors during use vary widely. For compactors, the main source of vibration is impact.
The difference in vibration characteristics is largely due to the difference in machine operation and the damping characteristics of the material being processed.
In order to provide a test method that gives better reproducibility measurements, this section uses a compaction on the energy absorber.
The machine works in such a way that its damping characteristics remain constant during the test. Workplace vibration exposure is assessed using GB/T 14790
program.
The value obtained is the type test value used to represent the average of the upper quartiles of the typical vibration quantities of the machine in actual use. however,
Actual values sometimes vary widely, depending on many factors, including the operator, work tasks, and insertion tools or consumables. Machine itself
The maintenance status may also be important. The effects of operators and operating procedures on low amplitude vibrations are particularly severe under real working conditions. because
Therefore, the vibration radiation value below 2.5 m/s2 is not recommended for evaluation under real working conditions. In this case, it is recommended to use a vibration of 2.5m/s2.
Momentum values directly assess the vibration of the machine.
If a specific workplace requires an accurate value, it is necessary to measure according to GB/T 14790 under this working condition. in
The measured vibration values under actual operating conditions may be higher or lower than those obtained in this part of GB/T 26548.
Under actual working conditions, the mismatch between the end of the compactor and the tamping material tends to produce higher vibration.
Handheld portable power tool vibration test method
Part 6. Tamping machine
1 Scope
This part of GB/T 26548 specifies the test method for hand-transmitted vibration radiation measurement at the handle of a hand-held portable power-driven compactor.
The method determines the type inspection procedure for the vibration amount of the grip portion of the handle when the machine is operated under the type test condition. The measured results are used for comparison
The amount of vibration of different types of machines of the same type.
This section applies to tamping machines, backfill tamping machines, claw type tamping machines, sand tamping machines and ground tamping machines driven by pneumatic or other powers (see
Chapter 5), the end or hammer is made of materials such as cast iron or rubber, used in foundry, construction sites and other places for sand compaction or tamping
operation.
Note. In order to avoid confusion between “power tools” and “insertion tools”, “machines” are used throughout this section instead of “power tools”.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6247.2-2013 Rock drilling machines and portable power tools - Terms - Part 2. Hydraulic tools (ISO 17066.
2007, IDT)
GB/T 14790.1-2009. Mechanical vibrations - Measurements and evaluations - Part 1 . General requirements
(ISO 5349-1.2001, IDT)
GB/T 14790.2-2014 Mechanical vibrations - Measurements and evaluations of exposure to hand-transmitted vibrations - Part 2. Workplace measurement
Practical Guide (ISO 5349-2.2001, IDT)
GB/T 25631-2010 Mechanical vibration hand-held and hand-guided mechanical vibration evaluation rules (ISO 20643.2005, IDT)
ISO 2787.1984 Performance test for rotary and impact pneumatic tools (Rotaryandpercussivepneumatictools-
Performancetests)
ISO 5391.2003 Pneumatic tools and mechanical vocabulary (Pneumatictoolsandmachines-Vocabulary)
EN12096.1997 Identification and verification of mechanical vibrational vibrational values (Mechanicalvibration-Declarationand
Verificationofvibrationemissionvalues)
3 terms, definitions and symbols
The following terms, definitions and symbols are defined in GB/T 6247.2-2013, GB/T 25631-2010 and ISO 5391.2003.
Used in this document.
3.1 Terms and definitions
3.1.1
Tamping machine rammer
Backfill tamping machine backfiltamper
It is used for compacting machines such as ground and foundry sand.
Note. Rewrite ISO 5391.2003, definition 2.2.8.
3.2 symbol
The following quantities and unit symbols apply to this document.
Symbol description unit
Root mean square (rms) uniaxial acceleration value of ahw frequency weighted hand-transmitted vibration m/s2
The total vibration value of the rmv frequency weighted root mean square acceleration is the root m/s2 of the sum of the squares of the components of ahw on the x, y, and z axes.
Ah The arithmetic mean m/s2 of the ahv value of all operators in the same holding position
ah The arithmetic mean m/s2 of the ah value for the same holding position on multiple machines
The vibration radiation value indicated by ahd is m/s2
Sn-1 standard deviation of a set of tests (for one sample, s) m/s2
σR reproducibility standard deviation (for a statistical population, σ) m/s2
Cv coefficient of variation for a set of experiments
K uncertainty m/s2
4 Basic criteria and vibration test methods
This part is based on the requirements of GB/T 25631-2010, and its structure is in addition to the appendix in terms of title and number.
GB/T 25631-2010 corresponds.
Appendix A provides the style of the test report, Appendix B is the method for determining the uncertainty K, and Appendix C is the design of the energy absorber for the compaction machine.
5 description of the machine type
This section applies to hand-held machines for casting sand compaction or stamping operations.
Figures 1 and 2 show examples of typical compactors covered by this part of GB/T 26548.
Figure 1 Compaction machine for compacting the ground
Figure 2 Compaction table for compaction workbench
6 Vibration characteristics description
6.1 Measurement direction
Hand-transmitted vibrations should be measured and recorded in three directions of the orthogonal coordinate system. The vibration of each grip position should be as shown in Figure 3~4.
Simultaneous measurement in the three directions shown.
6.2 Measuring position
Measurements should be taken at the location where the operator normally holds the machine and applies thrust. For one-handed machines, only one point is measured
The amount can be.
The specified sensor position should be as close as possible between the thumb and forefinger of the hand. This position is also suitable for holding in both hands during normal operation.
The location of the machine. Whenever possible, measurements should be taken at the locations specified here.
The replenishment position of the sensor is specified on the inside of the handle end as close as possible to the side of the specified position. If the specified position of the sensor is not
If used by law, the supplemental location should be used.
The specified position and replenishment position of the sensor should also be used on the damping handle.
For the position of the grip that is usually used in such different types of machines, Figure 3 to Figure 4 show the specified and replenished positions of the sensor.
And measurement direction.
Description.
1---the specified position of the sensor;
2---Additional position of the sensor.
Figure 3 Compacted ground tamping machine to measure position
Description.
1---the specified position of the sensor;
2---Additional position of the sensor.
Figure 4 Measuring position of the compaction table
6.3 The amount of vibration
The amount of vibration should meet the requirements of 6.3 of GB/T 25631-2010.
6.4 Synthesis of vibration direction
For the two holding positions used, the total vibration value obtained shall be recorded in accordance with 6.4 of GB/T 25631-2010. Capacity
Record and test at the holding position with the highest reading. The total vibration value at this holding position should be at least higher than the other positions.
30%. This result can be obtained by an operator for 5 trials at the initial test.
In order to obtain the total vibration value ahv for each test run, the measurement results in each direction should be synthesized according to equation (1).
Ahv= ahwx2 ahwy2 ahwz2 (1)
7 Instrument requirements
7.1 General
The instrumentation for testing shall comply with the provisions of 7.1 of GB/T 25631-2010.
7.2 Sensor installation
7.2.1 Technical requirements for sensors
The sensor specifications given in 7.2.1 of GB/T 25631-2010 apply to this section.
The total weight of the sensor and its fixtures should be as small as possible to the weight of the machine, handle, etc., without affecting the measurement results. This
One point is especially important for lightweight plastic handles (see GB/T 14790.2-2014).
7.2.2 Sensor connection
The sensor or the fixed block used should be rigidly attached to the handle surface.
If three single-axis sensors are used, they should be connected to the three sides of the fixed block.
For the case where the two axes are parallel to the vibrating surface, the measuring axes and vibrating tables of the two sensing elements of the two sensors or one triaxial sensor
The maximum distance of the face should be 10mm.
It is highly recommended to use a mechanical filter for the measurement.
7.3 Frequency weighting filter
The frequency weighting filter shall comply with the provisions of GB/T 14790.1-2009.
7.4 Cumulative time
Accumulation shall comply with the provisions of 7.4 of GB/T 25631-2010. The cumulative time for each test run should be no less than 16s to facilitate
The machine operation duration specified in 8.4 is consistent.
7.5 Auxiliary equipment
For pneumatic machines, the supply pressure should be measured with a pressure gauge with an accuracy of 0.01 MPa or higher.
For hydraulic machines, the flow rate should be measured with a flow meter with an accuracy of 0.25 L/min or higher.
For electromechanical machines, the voltage should be measured with a voltmeter with an accuracy equal to or higher than 3% of the effective value.
The thrust should be measured with a force measuring instrument with an accuracy higher than 1N—such as a force scale that the operator stands on.
7.6 Calibration
The technical requirements for calibration shall comply with the provisions of 7.6 of GB/T 25631-2010.
8 Machine test and operating conditions
8.1 General
Measurements should be made on new machines that are well lubricated and functioning properly. During the test, it should be similar to the way of normal compaction work.
Load and hold the machine. For some types of machines, if the manufacturer specifies a warm-up time, it should be guaranteed to warm up before the start of the test.
machine.
The compactor tests the vibration by tamping on the energy absorber. During the test, the thrust should be controlled while moving the compactor on the surface of the absorber.
See 8.4.
The power source supplied to the machine during the test shall be under the rated working conditions specified by the manufacturer, and the operation of the machine shall be smooth.
8.2 Operating conditions
8.2.1 Pneumatic machine
When conducting the test, the machine shall be operated at the maximum rated energy of the rated air pressure in accordance with the technical requirements of the manufacturer. The operation of the machine should be flat
Stable and should measure and record air pressure.
The machine should be supplied with a hose of the diameter recommended by the manufacturer. The test hose should be connected to the machine through a threaded pipe joint, preferably
Use the supplied threaded pipe joints. The length of the test hose should be 3 m. Test hoses are clamped with clamps and should not be used with quick-change joints.
The quality of the quick change joint affects the amount of vibration.
The supply pressure of pneumatic machines shall be measured in accordance with ISO 2787.1984 and maintained at the pressure values specified by the manufacturer.
During the test, the pressure measured directly before the hose shall not exceed 0.02 MPa from the pressure recommended by the manufacturer.
8.2.2 Hydraulic machine
The machine shall be operated at rated power (ie rated flow) during the test and shall be used in accordance with the technical requirements of the manufacturer.
stable. The machine should be preheated for approximately 10 minutes before the start of the measurement. The flow should be measured and recorded.
8.2.3 Electric machine
The machine shall be operated at rated voltage during the test and shall be used in accordance with the technical requirements of the manufacturer. The operation should be smooth and should be measured and recorded
Record voltage.
8.3 Provisions for other parameters
The thrust should be measured and recorded.
8.4 Additional equipment, artifacts, and tasks
The test shall be carried out on an energy absorber designed in accordance with Annex C.
The height of the energy absorber should be such that the operator can bend the elbow by 90° ± 10°. The tamping machine is on the front and rear of the surface of the absorber
Move within ±100mm range. The operation should be smooth. The installed energy absorber should not have any resonance in the vibration frequency range of the arm.
The test results are not affected.
The vertical downward thrust should be monitored during the test, for example, by the operator standing on the force scale. The applied thrust is equal to
The operator's weight is subtracted from the force reading instrument reading. See Figure 5 and Figure 6.
For a set of tests, the tamping machine should be operated 5 times on the energy absorbing device. When it is confirmed that the operation is stable, the reading is taken, and the stabilization time of each operation signal is obtained.
Should not be less than 16s.
Description.
1---Weighing scale.
Figure 5 Floor tamping machine operator working position
Description.
1---Weighing scale.
Figure 6 Work position of the tamping machine operator
8.5 operator
The machine should be operated by three different operators during the test. The operator has an influence on the vibration of the machine, so the operator should be able to cook
Practice the correct grip and manipulate the machine.
9 Measurement procedures and measurement effectiveness
9.1 Recording of vibration values
For each test machine, three sets of five consecutive measurements should be completed, each with a different operator.
The measured vibration value (see 6.4) should be recorded in accordance with Appendix A.
The coefficient of variation (Cv) and standard deviation (sn-1) for each handheld position of the three operators should be calculated. Coefficient of variation for a set of experiments
(Cv) is equal to the ratio of the standard deviation (sn-1) of the set of tests to the mean of the test.
Cv=
Sn-1
ahv
(2)
Since sn-1 is equivalent to srec (see Appendix B), the standard deviation of the ith ahvi value in the formula is.
Sn-1=
N-1∑
i=1
(ahvi-ahv)2 (3)
In the formula.
ahv---the average value of a set of tests, in meters per square second (m/s2);
n --- the number of measured values, n = 5.
If Cv is greater than 0.15 or sn-1 is greater than 0.3 m/s2, the error of the measurement process should be checked before accepting the measurement data.
9.2 Identification and verification of vibration values
The arithmetic mean ahv of the ahv value of 5 trial runs per operator should be calculated.
The arithmetic mean ah of the three ahv values obtained by the three operators at each holding position should be calculated.
For tests performed on only one machine, the value ahd is the highest of the ah values recorded for the two holding positions.
For tests conducted on three or more machines, the arithmetic mean ah of the ah value at each holding position of the different machines shall be calculated. Mark
The value ahd is the highest value of the ah values recorded for the two holding positions.
Both ahd and uncertainty K shall be expressed in accordance with the accuracy determined by EN12096.1997. Ahd should give the unit m/s2 and start with 1
The value of ahd is represented by three significant digits, where the last digit is only accurate to the half unit value of the previous digit (eg 1.20m/s2, 14.5m/s2);
Other values for ahd are sufficient with two significant digits (eg, 0.93m/s2, 8.9m/s2). The K value should be the same as ahd
The number of digits is indicated.
The uncertainty K shall be determined on the basis of the standard deviation σR of reproducibility according to EN12096.1997. K value should be attached
Record the requirements of B.
10 test report
The following information should be given in the test report.
a) refer to this part of GB/T 26548 (ie. GB/T 26548.6);
b) the name of the measurement laboratory;
c) the date of measurement and the name of the person in charge of the test;
d) detailed description of the hand-held machine (manufacturing company, model number, product number, etc.);
e) the indicated vibrational radiation value ahd and uncertainty K;
f) additional or inserted tools;
g) power source (provided air pressure, input voltage, etc.);
h) instruments (accelerometers, recording instruments, hardware, software, etc.);
i) the position and fixation of the sensor, the direction of measurement and each vibration value in each direction;
j) operating conditions and other quantities specified in 8.2 and 8.3;
k) Describe the test results (see Appendix A).
If other sensor locations or measurement methods other than those specified in this part of GB/T 26548 are used, they should be specified and
The reason for changing the position of the sensor is written into the test report.
Appendix A
(informative appendix)
Compaction machine vibration test report format
The vibration test report format is shown in Table A.1 and Table A.2.
Table A.1 General Information and Results Report
According to the provisions of GB/T 26548.6, this test was carried out.
Test facility
Testing unit (company/lab). Tester.
reporter.
Test date.
Test object and labeled value
Tested machines (power source and machine type, manufacturing company, machine model and
name).
The indicated vibration value ahd and uncertainty K.
measuring equipment
Sensors (manufacturing company, model, location, method of fixing, pictures and mechanical filters used).
Vibration measuring instruments. auxiliary equipment.
Operation and test conditions and measurement results
Test conditions (workpiece, holding position, picture).
Thrust during measurement. Power source (air pressure, hydraulic flow, voltage).
Record of other magnitudes. Speed setting during operation.
Table A.2 Measurement results of one machine
Date. Year Month Day Machine Model. Machine Number.
test
Serial number
operator
Numbering
test
frequency
Main handle (hold position 1)
Ahwx ahwy ahwz ahv
Operator statistics
ahv sn-1 Cv
Ah sR
test
Serial number
operator
Numbering
test
frequency
Auxiliary handle (hold position 2)
Ahwx ahwy ahwz ahv
Operator statistics
ahv sn-1 Cv
Ah sR
Note. ahv and ahv values are calculated according to 6.4 and 9.2, sn-1 and Cv are calculated according to 9.1, and sR is calculated according to Appendix B.
Appendix B
(normative appendix)
Determination of uncertainty
B.1 General
The uncertainty value K represents the uncertainty of the indicated vibrational radiation value ahd. For each batch of machines, the K value indicates the batch
The deviation of the vibration value of the machine, the unit is m/s2.
The sum of ahd and K represents the range of vibration values for a single machine, and/or the range over which most of the vibration values of a batch of new machines should be.
B.2 Test on a single machine
For tests conducted on only one machine, the uncertainty K shall be given by equation (B.1).
K=1.65σR (B.1)
In the formula.
σR—The standard ...
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